Preventing default behaviors in VueJS textarea components

Question

Preventing default behaviors in VueJS textarea components

I'm attempting to incorporate a slack-like feature that sends a message only when the exact Enter key is pressed (without holding down the Shift key).

Looking at this Vue template


<textarea type="text" v-model="message" @keyup.enter.exact="sendMessage($event)"></textarea>

with this component

export default {
  name: 'Typing',
  data() {
      return {
          message: null
      }
  },
  methods: {
      sendMessage(e) {
        // e.stopPropagation() and e.preventDefault() have no effect
        this.$socket.emit('message', { text: this.message });
        console.log(this.message); // Prints the message with an extra '\n' at the end due to the default behavior of the textarea
      }
  }
}

Does anyone have any suggestions on how I can prevent the extra '\n' without resorting to using a regex to remove it before sending it to the backend (which I believe would be messy) ?

Thank you

PS: I'm relatively new to the VueJS framework and I hope that my question is not too basic

EDIT: This question is similar but the proposed solution is not effective

javascript vue.js vuejs2 vue-component

Answer 1

Answer №1

Issue

<textarea
  type="text"
  v-model="message"
  @keyup.enter.exact="sendMessage($event)"
>
</textarea>

This code triggers the sendMessage method when the Enter key is pressed. However, due to the nature of the keyup event, it occurs after the key has been released. This results in the method being called after the default behavior of the key has already taken place (such as creating a new line) and after the key has been released. Using preventDefault in this scenario does not prevent the intended behavior as it occurs after the key event.

Resolution

Having identified the problem, we have determined the following:

We need to prevent the default action of pressing the Enter key.
The keyup event occurs after the default action has already taken place.

To address this, the solution is to prevent the default action on the keydown event and execute the method on the keyup event.

Important: It is crucial to only call the method on the keyup event to avoid multiple calls in case the user holds down the key.

  <textarea
    v-model="value"
    @keydown.enter.exact.prevent
    @keyup.enter.exact="send"
    @keydown.enter.shift.exact="newline"
  >
  </textarea>

A function that adds a new line to the textarea value can be invoked when the Enter+Shift combination is pressed.

Below is an example showcasing all the behaviors outlined in the solution.

new Vue({
  template: `
    <div>
      <textarea
        v-model="value"
        @keydown.enter.exact.prevent
        @keyup.enter.exact="send"
        @keydown.enter.shift.exact="newline"
      >
      </textarea>
    </div>
  `,
  
  data: {
    value: '',
  },
  
  methods: {
    newline() {
      this.value = `${this.value}\n`;
    },

    send() {
      console.log('========');
      console.log(this.value);
      console.log('========');
    },
  },
}).$mount('#root');

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
</head>
<body>
  <div id="root"></div>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.3/vue.min.js"></script>
</body>
</html>

Further Exploration

W3C Standard for Keyboard Events
Particularly focusing on event sequencing and various event types

Answer 2

Issue

<textarea
  type="text"
  v-model="message"
  @keyup.enter.exact="sendMessage($event)"
>
</textarea>

This code triggers the sendMessage method when the Enter key is pressed. However, due to the nature of the keyup event, it occurs after the key has been released. This results in the method being called after the default behavior of the key has already taken place (such as creating a new line) and after the key has been released. Using preventDefault in this scenario does not prevent the intended behavior as it occurs after the key event.

Resolution

Having identified the problem, we have determined the following:

We need to prevent the default action of pressing the Enter key.
The keyup event occurs after the default action has already taken place.

To address this, the solution is to prevent the default action on the keydown event and execute the method on the keyup event.

Important: It is crucial to only call the method on the keyup event to avoid multiple calls in case the user holds down the key.

  <textarea
    v-model="value"
    @keydown.enter.exact.prevent
    @keyup.enter.exact="send"
    @keydown.enter.shift.exact="newline"
  >
  </textarea>

A function that adds a new line to the textarea value can be invoked when the Enter+Shift combination is pressed.

Below is an example showcasing all the behaviors outlined in the solution.

new Vue({
  template: `
    <div>
      <textarea
        v-model="value"
        @keydown.enter.exact.prevent
        @keyup.enter.exact="send"
        @keydown.enter.shift.exact="newline"
      >
      </textarea>
    </div>
  `,
  
  data: {
    value: '',
  },
  
  methods: {
    newline() {
      this.value = `${this.value}\n`;
    },

    send() {
      console.log('========');
      console.log(this.value);
      console.log('========');
    },
  },
}).$mount('#root');

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
</head>
<body>
  <div id="root"></div>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.3/vue.min.js"></script>
</body>
</html>

Further Exploration

W3C Standard for Keyboard Events
Particularly focusing on event sequencing and various event types

Answer 3

Answer №2

It's so simple to solve your issue with this easy solution:

new Vue({
  el: '#app',
  data: {
    message: ''
  },
  methods: {
    sendMessage () {   
      console.log(this.message, this.message.length)
      // this.$socket.emit('message', {text: this.message});
      // clear textarea: this.message = ''
    }
  }
})

<div id="app">
  <textarea v-model="message" @keydown.enter.exact.prevent="sendMessage"></textarea>
</div>

<script src="https://unpkg.com/vue"></script>

Answer 4

It's so simple to solve your issue with this easy solution:

new Vue({
  el: '#app',
  data: {
    message: ''
  },
  methods: {
    sendMessage () {   
      console.log(this.message, this.message.length)
      // this.$socket.emit('message', {text: this.message});
      // clear textarea: this.message = ''
    }
  }
})

<div id="app">
  <textarea v-model="message" @keydown.enter.exact.prevent="sendMessage"></textarea>
</div>

<script src="https://unpkg.com/vue"></script>

Answer 5

Answer №3

Consider utilizing Vue's provided prevent function

<input type="text" v-model="username" @keydown.tab.prevent="checkUsername($event)"></input>

Answer 6

Consider utilizing Vue's provided prevent function

<input type="text" v-model="username" @keydown.tab.prevent="checkUsername($event)"></input>

Preventing default behaviors in VueJS textarea components

Answer №1

Issue

Resolution

Further Exploration

Answer №2

Answer №3

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